166 



ILLINOIS BIOLOGICAL MONOGRAPHS 



[166 



73 

 O 

 > 

 O 



S 

 o 



-M 



■-. 



O 



CD 

 CD 



u 



& 



m 



re 



o 



Pi 



J3 





 o 



d 



a 

 'c 



CD 

 Pi 

 X 



o> 



CM i« 



° £ 



O OS 



© 

 Pi 



.d 1-5 



-1-J 



be 



C 



cd 



73 



CD 



M 



bfl " 



n "C 



03 



bfl 

 d 

 CD 



bfl 



.a 

 3 



S3 



73 

 O 



PQ 



C-- 00 



d d 



co 



CO 



d 



73 

 O 



-M 

 bfl 



CD 



CM i-H CO 

 lO OS CO 



CO 



CM 



o3 



bfl 



h q a 



■>* J> r-5 



~ -d 



o 



bfl 

 CI 

 O) 



o> to u) 



CM tH CM 



-a 



01 



0> 



04 





t- ° ,« 



t- t- ■* 



© d ^ 



bfl 



0) 



© CO C£> 

 ^ i* ^1 



a3 



73 

 O 



pq 



co as «o 

 oq o- t-; 



odd 



73 bfl 



O d 



pq © 



t-. t_ o 



i> t^ oo 



•*-> bfl 



o a 



£h cp 



i-H 00 r-j 



T)i M ■* 



bfl 



o 



re 

 o 



M 



-E> 



a 



WHO 

 ri N * 

 CM CM CM 



CO CO CO 



CO 



CO 



CM 





co 



CO 



o 



u 



TO 



re 

 i_ 

 o 



> 



< 



co 

 o 



O) 



rs 



4) 



> 



re 



re 

 E 

 E 



3 



co 



CM 



CO 



T- ^ 



*~ CM 



ui * 



_l co 

 CO «>. 



< "- 



r- <a 



u 



e 



3 

 Q. 



re 



S 

 o 



■*-■ 



M 

 >> 



E 



< 



E 

 4) 



CD 



E 



> 



_1 



re 



E 

 CO 



CM r; CO N 

 CO CO CO CO 



_ X 

 O E 



m t- n q 

 ^ rf "* Tf 



o 



re 



E 



o 



O !_ 



CO 

 Q. 

 O 



3 



O 



>*- 



■ 



u 



E 



o 



